Results showed that response of both rice yield and N uptake to the 4 SRFs was in the order of isobutylidene diurea (IBDU ) > oxamide (OM) > urea (U) > guanylurea sulphate (GUS)> crotonylidene diurea (CDU) > CK.

• 结果表明:4种供试缓释氮肥对水稻增产效果和吸氮量的顺序均为:IBDU>OM>U>GUS>CDU>CK;